TL;DR
The Master Electrician License Exam exam is administered by State licensing boards via PSI Services or Prometric with a Approximately 35-55% first-attempt pass rate. This guide covers all 5 content domains, common failure modes, and sample questions. The exam format is 80-100 multiple-choice questions, open book (NEC codebook allowed) with a 4-5 hours time limit.
Master Electrician License Exam: Complete Guide
Everything you need to know before you start studying.
Exam Facts
What the Exam Tests
Advanced NEC
~25%Topics beyond journeyman level: hazardous locations (Articles 500-516, Class/Division/Zone classifications), emergency and standby systems (Articles 700-702), fire alarm systems (Article 760), and solar PV systems (Article 690 — increasingly tested).
Advanced Calculations
~20%Commercial building load calculations, multi-family dwelling calculations with demand factors, complex transformer configurations (delta-wye), and basic fault current calculations.
Services & Feeders
~15%Service entrance sizing (Article 230), service equipment requirements, the six-disconnect rule, and outside branch circuits and feeders (Article 225).
Special Equipment
~15%Swimming pools and fountains (Article 680), signs and outline lighting (Article 600), welders (Article 630 — duty cycle calculations), and A/C and refrigeration equipment (Article 440).
Business & Project Management
~25%Job estimating and bidding, permit processes, supervising apprentices and journeymen, OSHA electrical safety compliance, and basic business law. This section catches many tradespeople off guard.
Common Reasons Candidates Fail
1. Business and management questions
Experienced electricians who breeze through technical questions often struggle with estimating, bidding, permit processes, and supervision rules — topics they may not have formally studied.
2. Advanced NEC articles
Hazardous locations (Articles 500-516), emergency systems (Articles 700-702), and solar PV (Article 690) are rarely encountered on the job but heavily tested. The classification systems (Class I/II/III, Division 1/2) require specific study.
3. Complex commercial calculations
Commercial load calculations involve multiple demand factor tables, commercial-specific loads (sign circuits, show windows), and the interaction between multiple NEC articles. Multi-step problems with many variables lead to calculation errors.
Practice Questions
Click "Reveal answer" to see the correct answer and explanation.
Q1.A Class I, Division 1 location contains ignitable concentrations of flammable gases or vapors under which condition?
Q2.What is the maximum number of service disconnects permitted per NEC 230.71?
Practice adaptively for the Master Electrician exam: Valenke covers advanced NEC, commercial calculations, special equipment, and business management — all the topics beyond journeyman level.
Start free practice →Frequently Asked Questions
▶What is on the master electrician exam?
The master electrician exam covers everything on the journeyman exam plus: hazardous locations (Articles 500-516), emergency systems (Articles 700-702), solar PV (Article 690), commercial and multi-family load calculations, services and feeders, special equipment (pools, signs, welders, HVAC), and business management (estimating, permits, supervision, OSHA).
▶What is the master electrician exam pass rate?
First-attempt pass rates range from 35% to 55% depending on the state — lower than the journeyman exam. The business/management section and advanced NEC topics are the most common failure areas.